SU980256A1 - Single-shot multivibrator - Google Patents

Description

() ODAOVIBRATOR

one

The invention relates to a pulse technique and can be used in computing technology, radar, direct-printing telegraph devices as addressable pulse transmitters and discrete delay lines.

The one-shot is known, which contains an RS-trigger, one input of which is connected to the start input, and the other through a circuit and the NAND gate is connected to one of the outputs of the trigger cn.

The disadvantage of this one-shot is the impossibility of a discrete change in the duration of the generated pulse without reconfiguration.

Closest to the present invention is a one-shot containing a trigger, an element 2 AND-NOT, an invitor, a source follower, a diode and a time specifying an RC circuit. A single vibration allows smoothly changing the duration of the OUTPUT pulse over a wide range 2.

(The main disadvantage of a single vibrator is the impossibility of a discrete change in the pulse generated by it depending on the address of the input signal, since the single vibrator has only one input.

The purpose of the invention is to expand the functionality of the one-way radio by providing adjustment to N fixed Duration values.

To achieve the goal in the one-shot

15 containing the first RS-flip-flop, the output of which is connected to one of the inputs of the element 2 AND-NOT, the output of which is connected to the S-input of the first H5-three4-ger and with the facing time

The 20 capacitor, the second plate of which is connected to the inverter input through the matching cascade repeater, the inverter output is connected to the second 3980 input of element 2 –– ––––, and the input of the matching cascade is connected through the diode included in the reverse direction to the common power supply bus; OR NOT with N inputs, each of which is connected to the input circuit, consisting of a series-connected second RS-flip-flop, the R-input of which is connected to the input bus of the device and through a resistor connected to the common bus of the power supply the controlled key, the time of the master resistor, the controlled key input is connected to the output of the second RS flip-flop, and the time of the master resistor via the controlled key is connected to the common bus, the S input of the second RS-flip-flop is connected to the output of the inverter, the ends of the time of the setting resistors are combined and connected to the input of the matching stage, and the output of the element OR is NOT connected to the R-input of the first RS flip-flop. The drawing shows a structural diagram of the proposed one-shot. For simplicity, only three entered circuits are shown, consisting of a trigger, a key, a time of a master resistor, i.e. . The single vibrator contains an N-VHS element OR-NOT 1, the output of which is connected by the R input of the first RS flip-flop 2. The output of the latter is connected to the second input of the element 2I-NO 3, the output of which is connected to the S input of the first trigger 2 and with the lining time of the setting capacitor k, and the second capacitor plate is connected via a reverse bias diode 5 to the common power source bus and via matching cascade 6 to the input of the inverter 7, the output of which is connected to the input of the element 2И – НЕ 3, also contains resistors 8-10, the second trigger 11-13, time for giving resistor H Inputs the one-shot is connected to the R-inputs of the second flip-flops 11-13 and through the resistors 8-10 to the common bus power supply. The outputs of the second flip-flops 11-13 are connected to the controlled inputs of the controlled keys 15-17, one of the outputs of which is connected to the common power supply bus, and the second time setting resistors T, 18 and 19 are connected to the input of the matching stage 6. The input of the device is labeled Positions 20Odiavibrator works as follows. In the initial state, all inputs of the OR-NOT 1 element and the R-inputs of the second triggers are set to logical O due to resistors 8-10 connected to a common power supply, at the output of the OR-NOT 1 logical element, at the output of the RS flip-flop 2 g logical 1. The matching cascade repeater 6 is closed, at its output is logical O, at the output of inverter 7 is logical 1, at the output of element 2I – NO 3 is logical 1. Capacitor V is discharged through the open output transistor of element 3. At the outputs of the trigger 1113 is set to logical 0, so the keys 15-17 are closed. When a positive impulse is fed to one of the inputs (for example, to input 20), trigger 11 overturns and a logical 1 is set at its output, i.e. a positive voltage that opens the switch 15, which switches the time of the master resistor 10 to the common bus, thereby creating a capacitor charge circuit l. A negative pulse appearing at the output of an OR-NOT 1 element triggers trigger 2, a negative voltage drop appears at its output, which triggers element 2I-NOT 3, whose output transistor closes and the pulse formation process begins. In this case, the capacitor is charged along the circuit. + E "- collector resistor of the output transistor of the element 3 - capacitor 4 - time setting resistor H - public key 15 - common power supply bus. The matching stage b is open, the output of the inverter 7 is a logical O .. As the capacitor 4 charges, the voltage at the input of the matching stage 6 drops and when the threshold of the transistor reaches its end, the matching stage closes, at the output of the output level high potential i.e. a positive voltage drop that brings the trigger 11 to its original state. Negative voltage drop output of the element brings the trigger 2 to its original state.

When a signal is applied to any other input, the operation of a one-vibrarp is similar to that described above with the only difference that another additional trigger is connected, connected to its key — and the time of the master resistor, the value of which determines the duration of the generated pulse, since capacitor C is a common .

Thus, the proposed one-shot makes it possible to obtain N discrete values of pulse durations depending on the address of the input signals. An advantage is also the presence of N outputs, each of which can only have a pulse of a certain duration, and two outputs from which it is possible to remove the pulses of all the durations of both polarities.

Having only one capacitor determines the same stability of the generated pulses,

Claims (2)

1. Author's testimony of the USSR Vf cl. H Oj K 3/284, 1975. 2. PTE, 1972, If 4, p. P7.